hash-fixture 0.0.1

Produce lines of reproducible test fixture by repeated hashing

Produce lines of reproducible test fixture by repeated hashing.

For a given set of options the output is deterministic, it will always have the same checksum. So a large file can be reliably generated on demand, rather than downloaded or stored in version control. Conversely the expected checksum can be checked into version control, e.g. as part of a test suite.

Usage

>>> import hash_fixture
>>> lines = list(hash_fixture.lines(line_count=3))
>>> for line in lines: print(line)
b'000000001 hash-fixture/v0 sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=\n'
b'000000002 hash-fixture/v0 sha256-/ut7HrShdeoT1CKjUIP5z/V/AhSHvjknBr3HRo3H/j4=\n'
b'000000003 hash-fixture/v0 sha256-lL05gwF2SvDbQyK7C/2+JTFB4A3QMWYxn0fuLd9P5w0=\n'
>>>
>>> import hashlib
>>> hashlib.sha256(b''.join(lines)).hexdigest()
'3ef0546c961d1c40b848248cea7c552faa8ce1fdc49cda8c77a090f64e5a047f'

$ python3 -m hash_fixture --algorithm sha256 --line-count 3
000000001 hash-fixture/v0 sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=
000000002 hash-fixture/v0 sha256-/ut7HrShdeoT1CKjUIP5z/V/AhSHvjknBr3HRo3H/j4=
000000003 hash-fixture/v0 sha256-lL05gwF2SvDbQyK7C/2+JTFB4A3QMWYxn0fuLd9P5w0=
$ python3 -m hash_fixture --algorithm sha256 --line-count 3 | sha256sum
3ef0546c961d1c40b848248cea7c552faa8ce1fdc49cda8c77a090f64e5a047f

Install

Use

python3 -m pip install hash-fixture

or

uv pip install hash-fixture

or copy hash_fixture.py somewhere convenient, it is a self contained script.

License

MIT